Markel R.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

 Software and Firmware Development using C/C++/Assembly Language. 15 yrs. + experience.  Have good knowledge in Embedded Technologies: Bluetooth Low Energy, WiFi, Internet of Things, UART, ADC, SPI, I2C, CAN, and GPIO.  Maintain C Code using versioning tools such as WinCVS, TortoiseSVN, Git, Dynamsoft SCM.  Software Bug reporting and fix using Bugzilla.  Have used several microcontrollers for product development, and for personal learning. (Intel 8088(College), Zilog(Encore), PowerPC(PPC403, PPC405, PPC440, PPC460), Microchip PIC, Texas Instruments ARM 7 Cortex M3, Cortex M4, Texas Instruments MSP430, CC2640, CC2650 CC2640R2F, CC2652R, CC2642R, CC1352R1F and more).  Have experience developing Board Support Package Firmware, new software from scratch. That includes boot loaders, low-level device drivers and ISR(Interrupt Service Routine).  Have good understanding of RTOS. Have experience using TI-RTOS for work.  Have good understanding of electronics, and circuits as part of my degree B.S. Computer Engineering.  Have made custom PCB(Printed-circuit board) for controls.